MLA

Schwartz, Delmore, 1913-1966. "Made in America". Box 3, folder 173. undated. https://collections.library.yale.edu/catalog/17405226.

APA, 6th edition

Schwartz, Delmore, 1913-1966. (["Box 3, folder 173"])(undated)["Made in America"]. https://collections.library.yale.edu/catalog/17405226.